There is no fin nipping going on and the last time I had the water checked it was perfect but before it was good water the nirites were really high. But I got that under control beforeI added any fish to it. The 3 tetras are the only ones in the tank. I just called the people at the
LPS and they said that the nirites could have gone back up and they can't get enough oxygen. Do you think this is true and is there something I can do to help them get enough oxygen in their tank? Also they are swimming and playing together fine they just tilt to their side at times as they swim. And the biggest long finned black tetra in thier sometimes goes to the top and tilts to his side.